Fig. 3.

Dead-reckoned track of a European badger - Dead-reckoned track of a European badger (Meles meles) in Northern Ireland leaving its sleeping quarters (red dashed circle) and moving through the underground sett to emerge at the entrance (yellow circle). The vertical axis representing depth is shown as the pressure difference between the surface and any time underground. The reconstruction assumes that animal speed is directly proportional to VeDBA [4] underground in the same way it is on the surface. If this is not the case, the derived distances will be affected accordingly